All of the following are part of the immune system except:

White blood cell with reddish granules; numbers increase in allergic reactions:

Foreign material that invades the body:

Pigment produced from hemoglobin when red blood cells are destroyed:

Examples of immunoglobulins:

Respiratory disorder in the neonate:

Initially, a small 2.0-kg rock is whirling at the end of a very thin string in a circular path of radius 0.75 m on a horizontal frictionless surface, as shown in the figure. The initial tangential speed of the rock was 5.0 m/s. The string has been slowly winding around a vertical rod, and a few seconds later the length of the string has shortened to 0.25 m. What is the instantaneous speed of the mass at the moment the string reaches a length of 0.25 m?

Premature separation of placenta:

There is a foramen ovale in the skull and another in the fetal heart.  The foramen ovale in the fetal heart becomes the ______________ in the adult

the abdominal aorta divides at its distal end into which arteries?